US20230280139A1 - Firing device for shock tube - Google Patents
Firing device for shock tube Download PDFInfo
- Publication number
- US20230280139A1 US20230280139A1 US18/117,993 US202318117993A US2023280139A1 US 20230280139 A1 US20230280139 A1 US 20230280139A1 US 202318117993 A US202318117993 A US 202318117993A US 2023280139 A1 US2023280139 A1 US 2023280139A1
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- US
- United States
- Prior art keywords
- shock tube
- firing device
- primer
- tube adapter
- tray
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000035939 shock Effects 0.000 title claims abstract description 109
- 238000010304 firing Methods 0.000 title claims abstract description 72
- 238000005474 detonation Methods 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000002360 explosive Substances 0.000 abstract description 4
- 239000003999 initiator Substances 0.000 abstract description 3
- 239000011436 cob Substances 0.000 description 5
- 238000005422 blasting Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/043—Connectors for detonating cords and ignition tubes, e.g. Nonel tubes
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
- C06C5/00—Fuses, e.g. fuse cords
- C06C5/06—Fuse igniting means; Fuse connectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B9/00—Liquid ejecting guns, e.g. water pistols, devices ejecting electrically charged liquid jets, devices ejecting liquid jets by explosive pressure
- F41B9/0003—Liquid ejecting guns, e.g. water pistols, devices ejecting electrically charged liquid jets, devices ejecting liquid jets by explosive pressure characterised by the pressurisation of the liquid
- F41B9/0031—Liquid ejecting guns, e.g. water pistols, devices ejecting electrically charged liquid jets, devices ejecting liquid jets by explosive pressure characterised by the pressurisation of the liquid the liquid being pressurised at the moment of ejection
- F41B9/0043—Pressurisation by explosive pressure
- F41B9/0046—Disruptors, i.e. for neutralising explosive devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/0807—Primers; Detonators characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
- F42B39/30—Containers for detonators or fuzes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/10—Percussion caps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C7/00—Fuzes actuated by application of a predetermined mechanical force, e.g. tension, torsion, pressure
- F42C7/12—Percussion fuzes of the double-action type, i.e. fuzes cocked and fired in a single movement, e.g. by pulling an incorporated percussion pin or hammer
Definitions
- This disclosure relates to implementations of a firing device for shock tube.
- a firing device works in conjunction with a primer, often a 209 primer, for the purpose of generating an explosive shock wave through the shock tube to a detonator, such as a blasting cap.
- a primer often a 209 primer
- Single and dual firing devices have been used for many years to initiate non-electric shock tube. Most such devices provide a single primer to initiate an attached shock tube.
- primer misfire e.g., failing to detonate or failing to initiate the shock tube
- prior art firing devices are not configured to readily provide a second primer for another attempt at initiating the shock tube.
- Shock tube is a non-electric explosive initiator, well known to those of ordinary skill in the art.
- the firing device is configured to provide a redundant dual-ignition capability for connected shock tube. In this way, a second attempt to initiate the shock tube can be made immediately following a failed first attempt.
- the firing device includes a primer tray that can be preloaded with two primers. Using an operably connected selector, the primer tray can be rotated between use positions that individually locate each primer for detonation.
- An example firing device for shock tube comprises a body having a shock tube adapter on one end, a primer tray configured to hold two primers, and a selector operably connected to the primer tray.
- the shock tube adapter is configured to connect one end of shock tube to the firing device.
- the primer tray defines two primer apertures and can be rotated between two use positions. Each use position aligns one of the two primer apertures with an interior tubular aperture extending through the shock tube adapter.
- Another example firing device for shock tube comprises a body having a first end and a second end, a shock tube adapter attached to the first end of the body, a primer tray configured to hold two primers, a selector operably connected to the primer tray, and a debris shield removably attached to the first end of the body.
- the shock tube adapter is configured to connect one end of shock tube to the firing device.
- the primer tray defines two primer apertures and can be rotated between two use positions. Each use position aligns one of the two primer apertures with an interior tubular aperture extending through the shock tube adapter.
- the debris shield is configured to enclose the primer tray and a portion of the shock tube adapter.
- FIG. 1 is a side elevational view of a firing device for shock tube according to the principles of the present disclosure.
- FIG. 2 is a bottom isometric view of the firing device for shock tube shown in FIG. 1 .
- FIG. 3 is a top isometric view of the firing device for shock tube shown in FIG. 1 .
- FIG. 4 is a top plan view of the firing device for shock tube shown in FIG. 1 .
- FIG. 5 is a top isometric view showing the debris shield exploded from the firing device for shock tube depicted in FIG. 1 .
- FIG. 6 is an exploded front isometric view showing the components of the firing device for shock tube depicted in FIG. 1 , wherein fasteners are not illustrated for the sake of clarity.
- FIG. 7 is a front elevational view showing the components depicted in FIG. 6 .
- FIG. 8 is an exploded rear isometric view showing the components depicted in FIG. 6 .
- FIG. 9 is a rear elevational view showing the components depicted in FIG. 6 .
- FIG. 10 is another isometric view showing the debris shield exploded from the firing device for shock tube depicted in FIG. 1 , wherein the primer tray is rotated to the tray service position.
- FIG. 11 is an isometric view of the firing device for shock tube shown in FIG. 1 , wherein the debris shield has been removed and the primer tray rotated to the tray service position.
- FIG. 12 is a bottom plan view of the firing device for shock tube shown in FIG. 1 .
- FIG. 13 is an isometric view showing the firing device for shock tube depicted in FIG. 1 inserted into a cobb, and a center punch.
- FIG. 14 is another isometric view of the firing device for shock tube shown in FIG. 13 , wherein the center punch is inserted in the punch guide opening of the firing device.
- FIG. 15 is a side elevational view of the firing device for shock tube shown in FIG. 13 , wherein a length of shock tube connected to the firing device is shown wrapped about the exterior of the cobb.
- FIG. 16 is a top plan view of the firing device for shock tube shown in FIG. 15 , wherein an end of the shock tube is shown attached to the nozzle of the shock tube adapter by an instant fit connector.
- FIGS. 1 - 5 illustrate an example firing device 100 for shock tube according to the principles of the present disclosure.
- Shock tube 102 is a non-electric explosive initiator, well known to those of ordinary skill in the art.
- the firing device 100 is configured to provide a redundant dual-ignition capability for connected shock tube 102 (see, e.g., FIG. 16 ). In this way, a second attempt to initiate the shock tube 102 can be made immediately following a failed first attempt.
- the firing device 100 includes a primer tray 114 that can be preloaded with two primers (e.g., 209 primers). Using an operably connected selector 116 , the primer tray 114 can be rotated between use positions that individually locate each primer for detonation.
- a center punch 108 is used to individually detonate primers carried by the firing device 100 .
- An example center punch 108 comprises a handle 108 a and a spring-loaded punch 108 b having a pointed tip.
- a center punch, or “window breaker”, comprising a handle and a fixed punch having a pointed tip could also be used.
- the center punch 108 is not an element of the invention.
- the firing device 100 comprises a body 110 having a shock tube adapter 112 on one end, a primer tray 114 configured to hold two primers, a selector 116 operably connected to the primer tray 114 , and a removable debris sleeve 118 .
- the shock tube adapter 112 is configured to connect one end of shock tube 102 to the firing device 100 .
- the primer tray 114 includes two primer apertures 120 and can be rotated between two use positions, each of which aligns one of the primer apertures 120 with an interior tubular aperture 122 (also referred to as a “flash channel”) extending through the shock tube adapter 112 . In this way, a flame jet caused by detonation of a primer can travel through the primer aperture 120 , through the interior tubular aperture 122 , to the connected shock tube 102 , thereby initiating the shock tube 102 .
- the body 110 of the firing device 100 comprises a punch guide opening 124 for a center punch 108 , and a selector shaft bore 126 for a cylindrical selector shaft 128 operably connecting the selector 116 and the primer tray 114 .
- the punch guide opening 124 and the selector shaft bore 126 extend between a front end and a back end of the body 110 .
- a front section of the punch guide opening 124 defines a punch aperture 174 configured (i.e., sized) so that only the tip 108 b of the center punch 108 can extend therethrough.
- the tip of the spring-loaded punch 180 b is able to make contact with, and thereby detonate, a primer aligned with the punch aperture 174 by the primer tray 114 .
- the punch aperture 174 extends into an arcuate groove 176 on the front end of the body 110 .
- the body 110 includes two indexing tabs 130 located adjacent the back end of the body 110 . Each indexing tab 130 extends radially outward from the body 110 . As shown in FIGS. 13 - 15 , the indexing tabs 130 are configured to register with slots 106 in an end of a cobb 104 , thereby preventing the firing device 100 from twisting or falling through the cobb 104 .
- a cobb 104 known to those of ordinary skill in the art, is used to transport a firing device 100 , a blasting cap (not shown), and the shock tube 102 connecting the firing device 100 to the blasting cap.
- the shock tube adapter 112 of the firing device 100 is made of a nonferrous metal (e.g., brass) and secured to one end of the body 110 by a threaded fastener 132 .
- the shock tube adapter 112 includes a leg 134 used to offset it from the front end of the body 110 .
- a portion of the leg 134 is configured to interface with (i.e., fit within) a cutout 136 in the front end of the body 110 (see, e.g., FIGS. 5 and 6 ).
- the threaded fastener 132 extends through the leg 134 of the shock tube adapter 112 and is threadedly received within a threaded opening 138 in the cutout 136 of the body 110 .
- the cutout 136 is configured to mechanically prevent rotation of the shock tube adapter 112 relative to the body 110 of the firing device 100 .
- the shock tube adapter 112 also includes a nozzle 140 that has a threaded opening 142 in a distal end thereof.
- the threaded opening 142 is configured to receive an instant fit connector 144 , well known to those of ordinary skill in the art.
- the instant fit connector 144 is configured to connect the firing device 100 to an end of shock tube 102 (see, e.g., FIG. 16 ).
- shock tube 102 is inserted into the instant fit connector 144 .
- the shock tube 102 is secured to the firing device 100 and placed into communication with the flash channel 122 of the shock tube adapter 112 .
- the flash channel 122 extends into the threaded opening 142 of the nozzle 140 (see, e.g., FIG. 7 ).
- the flash channel 122 is also in fluid communication with at least one pressure vent 146 extending through the shock tube adapter 112 .
- the pressure vent 146 is a tubular aperture and configured to release pressure resulting from the detonation of a primer (see, e.g., FIG. 3 ). Accordingly, the pressure vent 146 may prevent the shock tube 102 from detaching and/or melting during ignition.
- the primer tray 114 is configured to pivot between a first use position, a second use position, and, when the debris sleeve 118 is removed, a tray service position. As shown in FIGS. 7 and 9 , the primer tray 114 includes two continuous apertures 120 that extend through the primer tray 114 . As shown in FIG. 6 , one end of each aperture 120 includes a primer pocket 148 configured (i.e., sized) to receive a primer. The primer pocket 148 may retain the primer therein via compression fit.
- the primer tray 114 also includes a pivot portion 150 that is operably connected to the selector 116 by the cylindrical selector shaft 128 extending through the body 110 of the firing device 100 .
- the pivot portion 150 of the primer tray 114 may include two detent recesses 178 . Each detent recess 178 is configured to partially receive a spring-loaded ball detent (not shown) located in the shock tube adapter 112 .
- Each detent recess 178 comprises a depression or hole formed in the pivot portion 150 of the primer tray 114 (see, e.g., FIG. 9 ).
- the spring-loaded ball detent in conjunction with the detent recesses 178 , is configured to temporarily fix the primer tray 114 in either the first use position or the second use position, and to provide tactile resistance to any rotational movement of the primer tray 114 .
- the selector 116 is located on an end of the body 110 , opposite the shock tube adapter 112 .
- the selector 116 comprises a switch handle 152 , having an elongated tab shape, that extends from the selector pivot axis (see, e.g., FIG. 2 ).
- the back end of the body 110 includes position indicia 154 , 156 for the selector 116 that correlate to the use position of the primer tray 114 (see, e.g., FIG. 8 ).
- the selector 116 is operably connected to the primer tray 114 by the cylindrical selector shaft 128 extending through the longitudinally extending bore 126 in the body 110 of the firing device 100 .
- the selector 116 and primer tray 114 are secured to opposite ends of the cylindrical selector shaft 128 by a threaded fastener.
- the debris sleeve 118 is configured for attachment to the end of the body 110 having the shock tube adapter 112 , and to enclose the primer tray 114 and the cylindrical body 160 and leg 134 of the shock tube adapter 112 . In this way, the primer tray 114 and flash channel 122 are protected from environmental debris that could cause a misfire, or otherwise inhibit detonation of a primer or ignition of the shock tube 102 .
- the debris sleeve 118 comprises a debris sleeve body 162 with an inner surface defining a hollow sleeve channel 164 .
- One end of the cylindrical sleeve body 162 includes an annular lip 166 that defines an opening 168 through which a portion of the shock tube adapter 112 extends.
- the other end of the cylindrical sleeve body 162 includes interior threads 170 configured to threadedly engage with a threaded portion 172 of the body 110 located adjacent a front end of the body 110 .
- the primer tray 114 of the firing device 100 can be loaded using the following steps. Initially, remove the debris sleeve 118 from the body 110 of the firing device 100 (see, e.g., FIG. 5 ). Then, using the selector 116 , rotate the primer tray 114 to the “tray service position” (see, e.g., FIG. 10 ). Next, after removing any spent primers, place a fresh primer in each primer pocket 148 of the primer tray 114 . Then, using the selector 116 , rotate the primer tray 114 to the first use position (see, e.g., FIG. 12 ).
- the primer tray 114 is now positioned between the underside of the shock tube adapter 112 and the front end of the body 110 (see, e.g., FIG. 5 ).
- the firing device 100 can be used to ignite the attached shock tube 102 using the following steps. Initially, insert a center punch 108 into the punch guide channel 124 in the body 110 of the firing device 100 . Then, strike the rear of the center punch handle 108 a , thereby causing the tip of the spring-loaded punch 108 b to strike the primer. In this way, the primer is detonated. In the event of a misfire, rotate the primer tray 114 to the second use position (see, e.g., FIG. 13 ). Then, strike the rear of the center punch handle 108 a again, thereby causing the tip of the spring-loaded punch 108 b to strike the primer. In this way, the second primer carried by the primer tray 114 is detonated.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
Description
- This application claims the benefit of U.S. Provisional Application Ser. No. 63/316,467, filed on Mar. 4, 2022, the entirety of which is incorporated herein by reference.
- This disclosure relates to implementations of a firing device for shock tube.
- A firing device works in conjunction with a primer, often a 209 primer, for the purpose of generating an explosive shock wave through the shock tube to a detonator, such as a blasting cap. Single and dual firing devices have been used for many years to initiate non-electric shock tube. Most such devices provide a single primer to initiate an attached shock tube. However, primer misfire (e.g., failing to detonate or failing to initiate the shock tube) is a known problem and prior art firing devices are not configured to readily provide a second primer for another attempt at initiating the shock tube.
- Accordingly, needs exist for the firing device for shock tube disclosed herein. It is to the provision of a firing device for shock tube configured to address these needs, and others, that the present invention is primarily directed.
- It is to be understood that this summary is not an extensive overview of the disclosure. This summary is exemplary and not restrictive, and it is intended neither to identify key or critical elements of the disclosure nor delineate the scope thereof. The sole purpose of this summary is to explain and exemplify certain concepts of the disclosure as an introduction to the following complete and extensive detailed description.
- Disclosed is a firing device for shock tube. Shock tube is a non-electric explosive initiator, well known to those of ordinary skill in the art. The firing device is configured to provide a redundant dual-ignition capability for connected shock tube. In this way, a second attempt to initiate the shock tube can be made immediately following a failed first attempt. To provide this functionality, the firing device includes a primer tray that can be preloaded with two primers. Using an operably connected selector, the primer tray can be rotated between use positions that individually locate each primer for detonation.
- An example firing device for shock tube comprises a body having a shock tube adapter on one end, a primer tray configured to hold two primers, and a selector operably connected to the primer tray. The shock tube adapter is configured to connect one end of shock tube to the firing device. The primer tray defines two primer apertures and can be rotated between two use positions. Each use position aligns one of the two primer apertures with an interior tubular aperture extending through the shock tube adapter.
- Another example firing device for shock tube comprises a body having a first end and a second end, a shock tube adapter attached to the first end of the body, a primer tray configured to hold two primers, a selector operably connected to the primer tray, and a debris shield removably attached to the first end of the body. The shock tube adapter is configured to connect one end of shock tube to the firing device. The primer tray defines two primer apertures and can be rotated between two use positions. Each use position aligns one of the two primer apertures with an interior tubular aperture extending through the shock tube adapter. The debris shield is configured to enclose the primer tray and a portion of the shock tube adapter.
-
FIG. 1 is a side elevational view of a firing device for shock tube according to the principles of the present disclosure. -
FIG. 2 is a bottom isometric view of the firing device for shock tube shown inFIG. 1 . -
FIG. 3 is a top isometric view of the firing device for shock tube shown inFIG. 1 . -
FIG. 4 is a top plan view of the firing device for shock tube shown inFIG. 1 . -
FIG. 5 is a top isometric view showing the debris shield exploded from the firing device for shock tube depicted inFIG. 1 . -
FIG. 6 is an exploded front isometric view showing the components of the firing device for shock tube depicted inFIG. 1 , wherein fasteners are not illustrated for the sake of clarity. -
FIG. 7 is a front elevational view showing the components depicted inFIG. 6 . -
FIG. 8 is an exploded rear isometric view showing the components depicted inFIG. 6 . -
FIG. 9 is a rear elevational view showing the components depicted inFIG. 6 . -
FIG. 10 is another isometric view showing the debris shield exploded from the firing device for shock tube depicted inFIG. 1 , wherein the primer tray is rotated to the tray service position. -
FIG. 11 is an isometric view of the firing device for shock tube shown inFIG. 1 , wherein the debris shield has been removed and the primer tray rotated to the tray service position. -
FIG. 12 is a bottom plan view of the firing device for shock tube shown inFIG. 1 . -
FIG. 13 is an isometric view showing the firing device for shock tube depicted inFIG. 1 inserted into a cobb, and a center punch. -
FIG. 14 is another isometric view of the firing device for shock tube shown inFIG. 13 , wherein the center punch is inserted in the punch guide opening of the firing device. -
FIG. 15 is a side elevational view of the firing device for shock tube shown inFIG. 13 , wherein a length of shock tube connected to the firing device is shown wrapped about the exterior of the cobb. -
FIG. 16 is a top plan view of the firing device for shock tube shown inFIG. 15 , wherein an end of the shock tube is shown attached to the nozzle of the shock tube adapter by an instant fit connector. - Like reference numerals refer to corresponding parts throughout the several views of the drawings.
-
FIGS. 1-5 illustrate anexample firing device 100 for shock tube according to the principles of the present disclosure.Shock tube 102 is a non-electric explosive initiator, well known to those of ordinary skill in the art. Thefiring device 100 is configured to provide a redundant dual-ignition capability for connected shock tube 102 (see, e.g.,FIG. 16 ). In this way, a second attempt to initiate theshock tube 102 can be made immediately following a failed first attempt. More specifically, thefiring device 100 includes aprimer tray 114 that can be preloaded with two primers (e.g., 209 primers). Using an operably connectedselector 116, theprimer tray 114 can be rotated between use positions that individually locate each primer for detonation. - A
center punch 108, well known to those of ordinary skill in the art, is used to individually detonate primers carried by thefiring device 100. Anexample center punch 108 comprises ahandle 108 a and a spring-loadedpunch 108 b having a pointed tip. However, it should be understood that a center punch, or “window breaker”, comprising a handle and a fixed punch having a pointed tip could also be used. Thecenter punch 108 is not an element of the invention. - As shown best in
FIGS. 1-9 , thefiring device 100 comprises abody 110 having ashock tube adapter 112 on one end, aprimer tray 114 configured to hold two primers, aselector 116 operably connected to theprimer tray 114, and aremovable debris sleeve 118. Theshock tube adapter 112 is configured to connect one end ofshock tube 102 to thefiring device 100. Theprimer tray 114 includes twoprimer apertures 120 and can be rotated between two use positions, each of which aligns one of theprimer apertures 120 with an interior tubular aperture 122 (also referred to as a “flash channel”) extending through theshock tube adapter 112. In this way, a flame jet caused by detonation of a primer can travel through theprimer aperture 120, through the interiortubular aperture 122, to the connectedshock tube 102, thereby initiating theshock tube 102. - As shown best in
FIGS. 6-9 , thebody 110 of thefiring device 100 comprises a punch guide opening 124 for acenter punch 108, and a selector shaft bore 126 for acylindrical selector shaft 128 operably connecting theselector 116 and theprimer tray 114. The punch guide opening 124 and the selector shaft bore 126 extend between a front end and a back end of thebody 110. A front section of the punch guide opening 124 defines apunch aperture 174 configured (i.e., sized) so that only thetip 108 b of thecenter punch 108 can extend therethrough. In this way, the tip of the spring-loaded punch 180 b is able to make contact with, and thereby detonate, a primer aligned with thepunch aperture 174 by theprimer tray 114. Thepunch aperture 174 extends into anarcuate groove 176 on the front end of thebody 110. Thebody 110 includes twoindexing tabs 130 located adjacent the back end of thebody 110. Eachindexing tab 130 extends radially outward from thebody 110. As shown inFIGS. 13-15 , theindexing tabs 130 are configured to register withslots 106 in an end of acobb 104, thereby preventing thefiring device 100 from twisting or falling through thecobb 104. Acobb 104, known to those of ordinary skill in the art, is used to transport afiring device 100, a blasting cap (not shown), and theshock tube 102 connecting thefiring device 100 to the blasting cap. - As shown best in
FIGS. 3-5 , theshock tube adapter 112 of thefiring device 100 is made of a nonferrous metal (e.g., brass) and secured to one end of thebody 110 by a threadedfastener 132. Theshock tube adapter 112 includes aleg 134 used to offset it from the front end of thebody 110. A portion of theleg 134 is configured to interface with (i.e., fit within) acutout 136 in the front end of the body 110 (see, e.g.,FIGS. 5 and 6 ). The threadedfastener 132 extends through theleg 134 of theshock tube adapter 112 and is threadedly received within a threadedopening 138 in thecutout 136 of thebody 110. Thecutout 136 is configured to mechanically prevent rotation of theshock tube adapter 112 relative to thebody 110 of thefiring device 100. Theshock tube adapter 112 also includes anozzle 140 that has a threadedopening 142 in a distal end thereof. The threadedopening 142 is configured to receive an instantfit connector 144, well known to those of ordinary skill in the art. The instantfit connector 144 is configured to connect thefiring device 100 to an end of shock tube 102 (see, e.g.,FIG. 16 ). Specifically, one end ofshock tube 102 is inserted into the instantfit connector 144. In this way, theshock tube 102 is secured to thefiring device 100 and placed into communication with theflash channel 122 of theshock tube adapter 112. For the purpose of clarity, it should be understood that theflash channel 122 extends into the threadedopening 142 of the nozzle 140 (see, e.g.,FIG. 7 ). In some implementations, theflash channel 122 is also in fluid communication with at least onepressure vent 146 extending through theshock tube adapter 112. Thepressure vent 146 is a tubular aperture and configured to release pressure resulting from the detonation of a primer (see, e.g.,FIG. 3 ). Accordingly, thepressure vent 146 may prevent theshock tube 102 from detaching and/or melting during ignition. - The
primer tray 114 is configured to pivot between a first use position, a second use position, and, when thedebris sleeve 118 is removed, a tray service position. As shown inFIGS. 7 and 9 , theprimer tray 114 includes twocontinuous apertures 120 that extend through theprimer tray 114. As shown inFIG. 6 , one end of eachaperture 120 includes aprimer pocket 148 configured (i.e., sized) to receive a primer. Theprimer pocket 148 may retain the primer therein via compression fit. Placing theprimer tray 114 in either the first use position or the second use position aligns one of theapertures 120 with both thepunch aperture 174 of thepunch guide channel 124 and theflash channel 122 leading to theshock tube 102 attached to the instantfit connector 144 on theshock tube adapter 112. Theprimer tray 114 also includes apivot portion 150 that is operably connected to theselector 116 by thecylindrical selector shaft 128 extending through thebody 110 of thefiring device 100. Thepivot portion 150 of theprimer tray 114 may include two detent recesses 178. Eachdetent recess 178 is configured to partially receive a spring-loaded ball detent (not shown) located in theshock tube adapter 112. Eachdetent recess 178 comprises a depression or hole formed in thepivot portion 150 of the primer tray 114 (see, e.g.,FIG. 9 ). The spring-loaded ball detent, in conjunction with the detent recesses 178, is configured to temporarily fix theprimer tray 114 in either the first use position or the second use position, and to provide tactile resistance to any rotational movement of theprimer tray 114. - As shown best in
FIG. 1 , theselector 116 is located on an end of thebody 110, opposite theshock tube adapter 112. Theselector 116 comprises aswitch handle 152, having an elongated tab shape, that extends from the selector pivot axis (see, e.g.,FIG. 2 ). The back end of thebody 110 includesposition indicia selector 116 that correlate to the use position of the primer tray 114 (see, e.g.,FIG. 8 ). Theselector 116 is operably connected to theprimer tray 114 by thecylindrical selector shaft 128 extending through thelongitudinally extending bore 126 in thebody 110 of thefiring device 100. Theselector 116 andprimer tray 114 are secured to opposite ends of thecylindrical selector shaft 128 by a threaded fastener. - As shown best in
FIGS. 3-5 , thedebris sleeve 118 is configured for attachment to the end of thebody 110 having theshock tube adapter 112, and to enclose theprimer tray 114 and thecylindrical body 160 andleg 134 of theshock tube adapter 112. In this way, theprimer tray 114 andflash channel 122 are protected from environmental debris that could cause a misfire, or otherwise inhibit detonation of a primer or ignition of theshock tube 102. As shown best inFIGS. 6-9 , thedebris sleeve 118 comprises a debris sleeve body 162 with an inner surface defining ahollow sleeve channel 164. One end of the cylindrical sleeve body 162 includes anannular lip 166 that defines anopening 168 through which a portion of theshock tube adapter 112 extends. The other end of the cylindrical sleeve body 162 includesinterior threads 170 configured to threadedly engage with a threadedportion 172 of thebody 110 located adjacent a front end of thebody 110. - Operation and Use
- The
primer tray 114 of thefiring device 100 can be loaded using the following steps. Initially, remove thedebris sleeve 118 from thebody 110 of the firing device 100 (see, e.g.,FIG. 5 ). Then, using theselector 116, rotate theprimer tray 114 to the “tray service position” (see, e.g.,FIG. 10 ). Next, after removing any spent primers, place a fresh primer in eachprimer pocket 148 of theprimer tray 114. Then, using theselector 116, rotate theprimer tray 114 to the first use position (see, e.g.,FIG. 12 ). In addition to aligning thefirst primer aperture 120 with thepunch aperture 174 of thepunch guide channel 124 and theflash channel 122 of theshock tube adapter 112, theprimer tray 114 is now positioned between the underside of theshock tube adapter 112 and the front end of the body 110 (see, e.g.,FIG. 5 ). Next, screw thedebris sleeve 118 onto thebody 110 of thefiring device 100 and thereby enclose the primer tray 114 (see, e.g.,FIG. 3 ). - Once the
primer tray 114 is loaded, thefiring device 100 can be used to ignite the attachedshock tube 102 using the following steps. Initially, insert acenter punch 108 into thepunch guide channel 124 in thebody 110 of thefiring device 100. Then, strike the rear of the center punch handle 108 a, thereby causing the tip of the spring-loadedpunch 108 b to strike the primer. In this way, the primer is detonated. In the event of a misfire, rotate theprimer tray 114 to the second use position (see, e.g.,FIG. 13 ). Then, strike the rear of the center punch handle 108 a again, thereby causing the tip of the spring-loadedpunch 108 b to strike the primer. In this way, the second primer carried by theprimer tray 114 is detonated. - Reference throughout this specification to “an embodiment” or “implementation” or words of similar import means that a particular described feature, structure, or characteristic is included in at least one embodiment of the present invention. Thus, the phrase “in some implementations” or a phrase of similar import in various places throughout this specification does not necessarily refer to the same embodiment.
- Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings.
- The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the above description, numerous specific details are provided for a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that embodiments of the invention can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations may not be shown or described in detail.
- While operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results.
Claims (17)
Priority Applications (1)
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US18/117,993 US11906277B2 (en) | 2022-03-04 | 2023-03-06 | Firing device for shock tube |
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US202263316467P | 2022-03-04 | 2022-03-04 | |
US18/117,993 US11906277B2 (en) | 2022-03-04 | 2023-03-06 | Firing device for shock tube |
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US20230280139A1 true US20230280139A1 (en) | 2023-09-07 |
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US3356025A (en) * | 1965-11-17 | 1967-12-05 | Stencel Aero Eng Corp | Pyrotechnic initiators |
US5012741A (en) * | 1990-04-16 | 1991-05-07 | The Ensign-Bickford Company | Initiator for a transmission tube |
US7451700B1 (en) * | 2004-04-14 | 2008-11-18 | Raytheon Company | Detonator system having linear actuator |
US7490554B2 (en) * | 2002-02-15 | 2009-02-17 | Ensign-Bickford Aerospace & Defence Company | Initiation fixture and an initiator assembly including the same |
US7665401B2 (en) * | 2003-12-01 | 2010-02-23 | Mas Zengrange (Nz) Ltd | Shock tube initiator |
US7765932B2 (en) * | 2006-05-22 | 2010-08-03 | Method Of Entry Technologies Pty Ltd | Shock tube initiator |
US9791247B2 (en) * | 2015-05-12 | 2017-10-17 | Cgs Group Llc | Firing device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US6272996B1 (en) | 1998-10-07 | 2001-08-14 | Shock Tube Systems, Inc. | In-line initiator and firing device assembly |
US6581519B1 (en) | 2001-10-11 | 2003-06-24 | Leslie K. Adams | Blasting cap initiator system |
US7650993B2 (en) | 2004-08-13 | 2010-01-26 | Ensign-Bickford Aerospace & Defense Company | Coreless-coil shock tube package system |
-
2023
- 2023-03-06 US US18/117,993 patent/US11906277B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3356025A (en) * | 1965-11-17 | 1967-12-05 | Stencel Aero Eng Corp | Pyrotechnic initiators |
US5012741A (en) * | 1990-04-16 | 1991-05-07 | The Ensign-Bickford Company | Initiator for a transmission tube |
US7490554B2 (en) * | 2002-02-15 | 2009-02-17 | Ensign-Bickford Aerospace & Defence Company | Initiation fixture and an initiator assembly including the same |
US7665401B2 (en) * | 2003-12-01 | 2010-02-23 | Mas Zengrange (Nz) Ltd | Shock tube initiator |
US7451700B1 (en) * | 2004-04-14 | 2008-11-18 | Raytheon Company | Detonator system having linear actuator |
US7765932B2 (en) * | 2006-05-22 | 2010-08-03 | Method Of Entry Technologies Pty Ltd | Shock tube initiator |
US9791247B2 (en) * | 2015-05-12 | 2017-10-17 | Cgs Group Llc | Firing device |
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US11906277B2 (en) | 2024-02-20 |
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